JPS6239023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a rotary gluing cylinder extending perpendicularly to the direction of movement of the material strip and having a glue transfer device, and an opposing holding mechanism attached thereto. The present invention relates to a glue application device for applying glue to this material strip in the form of lines running at right angles to the material strip, in particular as part of a device for producing folded products consisting of a plurality of signatures joined together.

The individual signatures of folded products, so-called tabloid products, consisting of folded pages that are temporarily stapled together are
Up until now, they have been held together using a U-shaped binding made of wire. However, these staples make the product very thick, which can have a very detrimental effect on stacking and packaging, especially on relatively thin products, such as 8 or 12 page products.

It is therefore an object of the invention to enable a staple-free joining of individual signatures by cross-gluing.

A gluing device of the first type mentioned is known from DE 11 33 232 A1. In this case, the gluing cylinder consists of two arms mounted on a driven shaft, each of which is equipped with an applicator bar at its radially outer end. Glue is applied onto these application bars by a glue supply cylinder that is immersed into a glue container. A deflection roll is used as the counter-cylinder, around which the material strip moves. However, devices of this type are only suitable for relatively low material web speeds. If the material stripping speed is high, the gluing cylinder needs to rotate at a high speed, so there is a risk that the glue may be scattered from the exposed rotating application bar. Even apart from this point, this type of applicator strip can only transfer very wide lines of glue. Furthermore, when pressing the material strip against the glued surface of the coating strip, the glue deviates to the side, which not only causes glue to accumulate at the edges of the transferred glue stripes, but also changes the width of the transferred glue stripes. . This phenomenon is further intensified when there is a possibility that the applicator strip is pushed into the glue supply cylinder, so that glue is supplied not only to the radially outer end surface of the applicator strip but also to both sides following this outer end surface. Ru. In this case, there is also the possibility that paper dust accumulates on these sides, thereby also influencing the shape of the glue streaks that are transferred. Therefore, a device of the type known from German Patent Application No. 11 33 232 is not suitable for producing folded products consisting of folded sheets that are joined together with glue.

Therefore, the problem underlying the present invention is to
It avoids the disadvantages of the known devices, operates reliably even at the high web speeds of the sizes common in the production of folded products, makes it possible to transfer precisely definable glue lines onto the material web, and eliminates the scattering of glue. or by providing a device of the first-mentioned type, which is free from the risk of contamination with paper dust, etc., and which therefore makes it possible to join the individual signatures of a folded product to be joined together without a stapler. be.

According to the present invention, this problem is solved as follows. In other words, at least one applicator roll is rotatably supported on the gluing cylinder parallel to the axis of the gluing cylinder, and the periphery of the applicator roll, which is provided with at least one glue receiving recess and is supplied with glue, is provided with a scraping device. a gluing device that rotates at a timing defined by the spacing of the streaks of glue to be applied, the area around which the glue is scraped off is at least partially exposed to the material strip passing by; The sum of the circumferential speed of the cylinder and the circumferential speed of the applicator roll that can be driven relative to it is equal to the speed of the material strip, and the counter-holding mechanism is arranged parallel to the applicator roll on the driven axis. It is configured as a piece provided in a cam shape.

This measure yields a very simple and reliable solution to the given problem. In this case, only the glue-receiving recesses of the applicator roll are filled with glue, and when the material strip is pressed against the applicator roll by means of the counter-holding mechanism, the glue is actually removed from the receptacle. The dimensions of the glue streak transferred in this way correspond exactly to the dimensions of the glue receiving recess. Therefore, the desired length and width of the glue line can be set accurately. The depth of the receiving recess influences the amount of glue to be transferred. The relative movement of the applicator roll and the gluing cylinder allows the gluing cylinder to be dimensioned taking only mechanical stresses into account. However, the synchronization of the applicator roll and the material strip is ensured, which prevents contamination of the material strip by the glue. At the same time, by rotating the applicator roll, the glue can be easily and reliably supplied again to the glue storage recess from which the glue has been removed. Scraping the glue of the applicator roll not only ensures a precise filling of the glue-receiving recesses, but at the same time the surface of the applicator roll is practically free of glue, so that virtually no paper dust can be deposited on this surface. , this has a very favorable influence on maintenance. The measures according to the invention make it possible to join the individual signatures of folded products without staples, thereby eliminating the need for the binding devices hitherto used for this purpose, thereby reducing the structure and space requirements of the folding device. It can be done easily. At the same time, the staple eliminates the thickening on one side, which was often considered a disadvantage, thereby facilitating the formation and packaging of the deposit.

In an advantageous further development of the means according to the invention, the applicator roll is rotatably accommodated in a receiving recess which is provided close to the periphery of the gluing cylinder and interrupts the periphery in the form of a longitudinal slot. can do. This means provides excellent support for the applicator roll and
It ensures sufficient coverage around the applicator roll with glue-receiving recesses, which further increases reliability and ease of maintenance.

Another advantageous measure is for the glue-receiving recess to be constructed as a longitudinal groove extending parallel to the axis and ending close to the end of the applicator roll, which longitudinal groove is in any case wider than the minimum width of the material strip that can be processed. It's short. This makes it unnecessary to modify the gluing device according to the invention even if the width of the material strip changes. Continuous or interrupted glue lines also make it possible to join sheets cut from wide material strips.

According to another preferred embodiment of the measures according to the invention, the scraping device has a scraping piece which is accommodated substantially radially movably in a corresponding guide recess of the gluing cylinder and rests against the peripheral part of the applicator roll; On the applicator roll side, this scraping strip has at least one glue reservoir delimited by a frame-shaped scraping edge, which glue reservoir can be connected to a glue supply device. This measure ensures that in each direction of rotation of the applicator roll a regular scraping of its circumferential surface takes place. At the same time, it is possible to prevent the scraped edge from sinking into the glue storage recess. Preferably, the scraping strip can be pressed around the applicator roll. This pressing can advantageously be carried out using compressed air, which makes it possible to adjust the pressing pressure during continuous operation.

Another advantageous embodiment of the means according to the invention is that the cam-shaped piece of the counter-holding mechanism, which rotates with the timing of the gluing cylinder, has a soft pressing cushion made of an elastic material on the applicator roll side; is at the point where the circumferential velocity of is equal to the velocity of the material strip.
This measure allows a damage-free handling of the material strip and at the same time ensures sufficient contact of the material strip to the applicator roll and thus a reliable reception of the glue provided by the glue-receiving recess.

Further preferred developments and advantageous developments of the measures according to the invention emerge from the following description of an exemplary embodiment with reference to the drawings together with the other embodiment claims of the patent claims.

The structure and operation of folding devices are known;
Therefore, the explanation is omitted here. A pair of pulling rolls 1 are provided at the entrance of the folding device shown in FIG.
is supplied, and the material web is subdivided into sheet-like products by means of this cross-cutting device 3. The crosscutting device 3 includes a cutting cylinder 4 with blades (not shown here), with which a counter cylinder 5 with cutting grooves, needles and folding blades (not shown) cooperates. The folding blade (not shown) transfers the material strip portion whose tip is held by an attached needle to a folding claw (not shown) provided on the subsequent cylinder 6 while forming a transverse fold. The barrel 6 with folding claws can cooperate with a belt leading to an impeller or the like, although not shown.
Two strips of material are required to produce an 8-page folded product. In the embodiment shown, the material strip 2 is therefore formed from two overlapping strips 2a and 2b.

In order to join the individual overlapping sheets cut from the material strip 2 without a staple, these sheets are glued together in the region of the transverse fold formed during the transition from cylinder 5 to cylinder 6. Ru. For this reason, the horizontal cutting device 3
and in front of the pair of tension rolls 1 there is provided a gluing device, generally designated 7, which provides a strip of glue extending laterally to the inside of the strip 2a of the material strip, i.e. to the side facing the adjacent strip 2b, and which, after suitable hardening, This glue line ensures the bonding of the sheet-like products produced by the cutting device 3. The gluing device 7 operates in precise register with respect to the folding blades of the cylinder 5, ie the gluing streaks are applied to the strips 2a of the material strip 2 at the points where later transverse folding is to be carried out. Advantageously, the glue used is a short-fiber cold-curing dispersion glue that requires relatively short curing times, which facilitates the transfer of the glue.

In a two-strip material strip, it is sufficient to provide a glue strip on one strip. The other strips, namely strip 2b, are then simply turned around so that both strips 2b in the area of tension roll pair 1
Registration occurs when a and 2b are brought together. The travel path of both strips 2a and 2b must therefore be the same or may differ by one or more partial lengths that can just be formed by the transverse device 3. In the embodiment shown, two deflecting rolls 8 and 9 are provided for deflecting the strip 2b, by means of which the strip 2b is guided around adjacent elements of the gluing device 7. In order to set the desired registration, the turning roll 8 can be supported movably.

The gluing device 7 here includes a gluing cylinder 11 into which an applicator roll 10 is incorporated, and an opposing holding mechanism 12 facing the gluing cylinder 11 . The material strip 2 is passed between the gluing cylinder 11 and the counter-holding mechanism 12 . As can be clearly seen from Figure 2, the gluing cylinder 11
is provided with a hole forming a receiving recess 13 parallel to the axis for accommodating the applicator roll 10, the diameter of which corresponds to the diameter of the applicator roll 10 rotatably accommodated therein. . Accommodation notch 1
The holes forming 3 are covered in the area of both end faces of the gluing cylinder 11 by a cover plate 14, which is schematically shown in FIG. Cover plate 14
can be supported. The accommodation notch 13 is provided close to the periphery of the gluing cylinder 11, and its contour slightly intersects with the contour of the outer circumference of the gluing cylinder 11, so that the interrupted part of the outer contour of the gluing cylinder 11 is vertically disposed. This is caused by the slit 16.

The gluing cylinder 11 carries out an integral number of revolutions with respect to the product length produced by the cross-cutting device 3, i.e. 1
During the passage of the two partial lengths, the gluing cylinder 11 undergoes one rotation or an integral multiple thereof. Gluing cylinder 1
An applicator roll 10 installed in 1 can be driven relative to this gluing cylinder. For this purpose, in the illustrated exemplary embodiment, a transmission (not shown) is provided in the area of the cover plate 14, preferably constructed as a planetary transmission, via which the applicator roll 10 can be moved, for example, to the side by an end drive. The sum of the circumferential speed of the gluing cylinder 11 and the circumferential speed of the applicator roll 10 is made equal to the speed of the material strip 2. Depending on the diameter of the gluing cylinder 11, the applicator rolls 10 can be rotated in the same direction or in opposite directions. Gluing cylinder 11 can therefore be dimensioned without taking into account the surroundings.

The applicator roll 10 has at least one glue-receiving recess 17 on its circumferential side, which is filled with glue during each revolution of the applicator roll 10 and removes the glue when passing through the longitudinal slot 16. exposed for transfer. For this purpose, the strip 2a is pressed against the peripheral part of the applicator roll 10 which is exposed in the area of the longitudinal slot 16 and moves at the speed of the material strip. The counter-holding mechanism 12 provided for this purpose includes a driven shaft 18 to which a pressure bar 19 parallel to the applicator roll 10 or to the glue receiving recess 17 is attached. The pressure bar 19 is provided with a soft rubber strip forming an elastic pressure cushion 20 on the applicator roll side, which can be inserted into a corresponding recess in the bar 19 or glued. The counterholding mechanism 12 rotates once during the passage of the material strip length. The circumferential speed in the area of the radially outer edge of the pressure cushion 20 is equal to the speed of the material strip. The effective diameter and rotational speed of the counterholding mechanism 12 are therefore equal to the effective diameter and rotational speed of the cutting cylinder 4, which likewise performs one revolution per part length. The shaft 18 of the counter-holding mechanism 12 and the glue cylinder 11 are transmission-coupled to each other, for example by means of spur gears, so that the pressure cushion 20 and in each case one glue-receiving recess 17 cooperate when the cross-folding point passes. ing. Pressure cushion 2
The material strip pressed onto the applicator roll 10 by the glue receiving recess 1 facing the pressing cushion 20
This recess 17 virtually automatically removes the glue present in 7.
pull out from This delivery of the glue is facilitated if the dispersed glue is short fibers.

In the illustrated embodiment, the applicator roll 10 is provided with a plurality of glue-receiving recesses 17 evenly distributed around its circumference. The number and pitch of these recesses are dependent on the required relative speed of the applicator roll 10 with respect to the gluing cylinder 11. In the illustrated embodiment, the gluing cylinder 1
The circumferential speed of material band 1 should be approximately 9/10 that of material band 2.
In order to obtain the full speed of the material strip, the remaining 1/10 is achieved by the relative movement of the applicator roll 10 with respect to the gluing cylinder 11. Therefore, the applicator roll 10
In the illustrated embodiment, it has ten glue receiving recesses 17, which are uniformly distributed around the circumference, corresponding to ten pitches. Therefore, each rotation of the glue cylinder 11 causes the next glue receiving recess 17 to open in the longitudinal slit 1.
Enter the range of 6.

As can be clearly seen in FIG. 3, the glue receiving recesses 17 are configured as longitudinal grooves defined by closed annular edges and extending parallel to the axis, and these longitudinal grooves are cut around the applicator roll 10. It is rare. In the illustrated embodiment, the glue streaks transferred to the strips 2a are formed as continuous streaks. Therefore, the groove forming the glue receiving recess 17 is formed as a groove extending over substantially the entire length of the applicator roll 10. The inner width and depth of these grooves define the width and thickness of the glue strips to be transferred. Since the length of the groove forming the glue-accommodating recess 17 is slightly smaller than the minimum width of the material strip to be processed, removal of the glue over the entire length of the groove is ensured even in the processing of this material strip, and no modification of the machine is required. be. The applicator roll 10, here constructed as a continuous roll, is provided with journals 21 on its sides, which engage in bearings 15 and have associated drive elements. The length of the gluing cylinder 11, which is arranged perpendicular to the direction of movement of the material strip, is approximately equal to the total length of the applicator roll 10 including the journal 21. Instead of a continuous application roll, it is also possible to use a plurality of short application rolls arranged side by side. It is also conceivable to interrupt the glue receiving recess 17 once or several times over the length of the applicator roll 10.

In order to supply glue to the applicator roll 10, a glue reservoir 22 is provided approximately diametrically relative to the longitudinal slot 16 and is closed by a built-in part on the glue cylinder 11 and the applicator roll 10. A glue receiving recess 17 provided around the applicator roll 10 passes through a glue reservoir 22 due to the rotation of the applicator roll 10 and receives glue therein. The other surface of the applicator roll 10 is scraped of glue, so that the area between the glue receiving recesses 17 is free of glue. This prevents dirt from accumulating in these areas. However, the glue receiving recess 17 filled with glue is exposed only after entering the vertical slit 16. Vertical slit 16 and glue reservoir 22
In other places, the applicator roll 10 is in the accommodation notch 13.
is in sufficient contact with the wall. Splashing of the glue is advantageously not possible in this case. The built-in part including the glue reservoir 22 is designed as a scraping piece 23, as can be further seen in FIG. . The guide recess 24 actually opens into the receiving recess 13 in which the applicator roll 10 is located. The scraping piece 23 is actually formed by a beam extending over the length of the applicator roll 10, and its surface on the applicator roll side is curved with the same radius as the applicator roll 10. The curved surface of the scraping piece 23 is pressed against the application roll 10. For this purpose, in the illustrated embodiment a pressure spring 25 is provided and the guide recess 24
It is supported by a piece 26 that covers. However, it is also conceivable to press the scraping strip 23 onto the applicator roll by means of a hydraulic or pneumatic pressure medium. The pressure medium can be supplied, for example, via a central supply in the gluing cylinder 11. The glue reservoir 22 is divided by a frame-shaped scraped edge 27. This ensures that the glue receiving recess 17 is filled with glue and that the other surface areas of the applicator roll 10 remain free of glue. The frame-shaped scraped edge 27 is
This advantageously prevents the scraping piece 23 from sinking into the glue receiving recess 17. Application roll 10 and scraping piece 2
The interengaging surfaces of 3 are smooth to avoid wear. Advantageously, at least one of these surfaces has very anti-friction properties. In the illustrated embodiment, the surface of the applicator roll 10 is plated with chrome. The surface of the corresponding scraping piece 23 is coated with tetrafluoroethylene.

The glue reservoir 22 can be designed as a single recess. On the other hand, as can be clearly seen from FIG. 4, a plurality of grooves 28 are provided side by side,
In this case, it is bent into a V-shape in the rotation direction of the coating roll 10. This effectively pulls the glue towards the center of the scraping strip. The supply of glue to the groove 28 takes place in the area of its lateral ends. For this purpose, a feed hole 29 exiting from the distribution chamber 30 is provided. This distribution chamber 30 can simply be designed as a closed blind hole. Glue is fed in the center of the distribution chamber 30 in order to evenly distribute the glue into the supply holes 29 which are provided over the entire length of the distribution chamber 30. For this purpose, a horizontal hole 31 is provided, and as can be clearly seen from FIG. 2, the entrance cross section of this horizontal hole 31 is at least partially in line with the exit cross section of a passage 32 provided on the gluing cylinder side and formed by the hole. . A channel 32, which can be formed by a hole in the region of the gluing cylinder 11, leads via a rotary connection coaxially arranged in the region of the gluing cylinder end face to, for example, a glue tank (not shown here). It leads to a glue source configured as a pump. Due to the supply of glue under pressure, the precise filling of the glue receiving recess 17 is likewise advantageously influenced.

Above, particularly preferred embodiments have been described in detail.
The present invention is not limited to this. It is readily conceivable, for example, to provide more than one applicator roll around the gluing cylinder 11. Similarly, a plurality of gluing devices 7 can be arranged side by side or side by side. If an 8-page product consisting of two signatures is to be produced, one gluing device, which applies the glue strips to the strips, is sufficient. For larger numbers of pages or signatures, one additional gluing device is added per added strip.

Instead of the illustrated scraping piece, a scraping blade formed by a plate can also be used. Particularly when continuous glue-receiving recesses are used, such a scraping blade may be provided at a slight inclination to the axis of the applicator roll to facilitate movement of the scraping edge beyond the glue-receiving recess. It is advantageous to do so.

[Brief explanation of the drawing]

1 is a schematic side view of a folding device for producing 8-page folded products with a horizontal gluing device;
The figure is an enlarged sectional view of the gluing cylinder and opposing holding mechanism of the horizontal gluing device, FIG. 3 is a front view of the applicator roll, and FIG. 4 is a front view of the scraping piece seen from the applicator roll. 2...Material band, 2a, 2b...Strip, 7...Gluing device, 10...Applying roll, 11...Gluing cylinder, 12...Opposing holding mechanism, 16...Vertical slit, 17...Glue storage recess Location, 18...Axis, 19...
...Ball piece, 22... Glue reservoir, 23... Scraping piece,
27...Scraped edges.

Claims (1)

[Claims] 1. A rotary gluing cylinder 11 extending perpendicularly to the moving direction of the material strip and having a glue transfer device, and an opposing holding mechanism 12 attached thereto; Apply glue in the shape of lines extending at right angles to this material strip 2.
At least one applicator roll 10 is rotatably supported on the gluing cylinder 11 parallel to the axis of the gluing cylinder 11 and is provided with at least one glue receiving recess 17 for supplying glue. The area around the coating roll 10 is scraped by a scraping device 23,
27 so that the area around which the glue has been scraped off is at least partially exposed to the material strip 2 passing by, at a timing defined by the spacing of the streaks of glue to be applied. The sum of the circumferential speed of the rotating gluing cylinder 11 and the circumferential speed of the applicator roll 10, which is located around the gluing cylinder 11 and can be driven relative to it, is equal to the speed of the material strip 2, and the opposing holding mechanism 12 is a cam-shaped piece 19 provided on the driven shaft 18 in parallel to the coating roll 10.
Apparatus for applying glue in streaks to a moving material strip perpendicular to its direction of movement, characterized in that it is configured as follows. 2. The applicator roll 10 is rotatably housed in a housing notch 13 provided close to the periphery of the gluing cylinder 11 and interrupting the periphery in the form of a vertical slit 16. A device according to scope 1. 3. According to claim 1 or 2, the applicator roll 10 extends over the entire length of the gluing cylinder 11 and is supported by a bearing 15 provided in the area of the end face of the gluing cylinder. The device described. 4. characterized in that the glue receiving recess 17 is configured as at least one continuous longitudinal groove extending parallel to the axis and terminating close to the end of the applicator roll, said longitudinal groove being shorter than the minimum width of the processable material strip; An apparatus according to claim 1, wherein: 5. Device according to claim 1 or 3, characterized in that the applicator roll 10 has a plurality of glue-receiving recesses 17 uniformly distributed around its circumference. 6. Device according to claim 1, characterized in that the applicator roll 10 is electrically connected to the gluing cylinder 11 via a transmission preferably constructed as a planetary transmission. 7. The scraping device has a scraping piece 23 which is accommodated substantially radially movably in a corresponding guide recess 24 of the gluing cylinder 11 and contacts the peripheral part of the applicator roll 10; Claim 1 characterized in that it has at least one glue reservoir 22 on its side, which is delimited by a frame-shaped scraping edge 27, and which glue reservoir 22 is connected to a glue supply device. Equipment described in Section. 8 A plurality of glue reservoirs formed by a plurality of grooves 28 bent in a V-shape preferably in the direction of rotation of the applicator roll 10 are provided on the scraping piece 23, preferably in the range of both ends of these grooves 28. characterized in that the glue reservoir is connected to the distribution chamber 30 via at least one feed hole 29 in each case,
Apparatus according to claim 7. 9 a channel 3 in which the distribution chamber 30 has an inlet cross-section located preferably approximately in the central region of the scraping strip 23 and is preferably formed by a hole in the region of the gluing cylinder 11;
2, in the terminal cross section opening to the guide notch 24,
The inlet cross sections of the distribution chamber 30 at least partially overlap,
9. Device according to claim 8, characterized in that the channel 32 is connected to the glue source via a rotary connection coaxially arranged in the region of the end face of the glue cylinder. 10. Claim 7, characterized in that the scraping piece 23 can be pressed onto the applicator roll 10 by means of a pressure medium, preferably hydraulic or pneumatic.
Apparatus according to any one of clauses 1 to 9. 11. Any one of claims 7 to 10, characterized in that at least one of the scraping piece 23 and the applicator roll 10 is provided with a coating preferably having extremely anti-friction properties in the area where they contact each other. The device according to any one of the above. 12 The cam-shaped piece 19 of the opposing holding mechanism 12 that rotates at the timing of the gluing cylinder 11 is
2. The apparatus according to claim 1, characterized in that a soft pressure cushion (20) made of an elastic material is provided on the applicator roll side, and the effective circumferential speed of this pressure cushion (20) is equal to the speed of the material strip (2). 13 A horizontal cutting device 3 for dividing the material strip 2 consisting of a plurality of strips 2a, 2b into sheet-like products and a horizontal folding device are installed after this, and each strip 2a of the material strip 2 except for one strip 2b is cut horizontally. A gluing device 7 is provided in front of the cutting device 3 and has a gluing cylinder 11 and a facing holding mechanism 12, and the corresponding strips 2a are passed between the gluing cylinder 11 and the facing holding mechanism 12, respectively. 2. Device according to claim 1, characterized in that the non-glued strips 2b are turned in register. 14. Device according to claim 13, characterized in that the effective diameter of the counter-holding mechanism 12 is equal to the effective diameter of the cutting cylinder 4 of the cross-cutting device 3. 15. Apparatus according to any one of claims 1 to 6, characterized in that the adhesive is scraped off from the applicator roll 10 by a scraping blade arranged preferably obliquely to its axis. .